/*
    Gtalk is a videoconference application on the Android Platform.

    Copyright (C) 2009 by Frederic-Charles Barthelery,
                          Jean-Manuel Da Silva,
                          Nikita Kozlov,
                          Philippe Lago,
                          Jean Baptiste Vergely,
                          Vincent Veronis.

    This file is part of Gtalk.

    Gtalk is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Gtalk is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Gtalk.  If not, see <http://www.gnu.org/licenses/>.

    Please send bug reports with examples or suggestions to
    contact@Gtalk-project.com or http://dev.Gtalk-project.com/

    Epitech, hereby disclaims all copyright interest in the program "Gtalk"
    written by Frederic-Charles Barthelery,
               Jean-Manuel Da Silva,
               Nikita Kozlov,
               Philippe Lago,
               Jean Baptiste Vergely,
               Vincent Veronis.

    Nicolas Sadirac, November 26, 2009
    President of Epitech.

    Flavien Astraud, November 26, 2009
    Head of the EIP Laboratory.

 */
package org.lansir.af.gtalk.smack.pep;

import java.util.ArrayList;
import java.util.List;

import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.filter.PacketExtensionFilter;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smackx.pubsub.EventElement;
import org.jivesoftware.smackx.pubsub.EventElementType;
import org.jivesoftware.smackx.pubsub.Item;
import org.jivesoftware.smackx.pubsub.ItemsExtension;
import org.jivesoftware.smackx.pubsub.PubSubManager;
import org.jivesoftware.smackx.pubsub.LeafNode;

/**
 * Little extension of {@link PubSubManager} which allows to add
 * {@link PEPListener}.
 * 
 */
public class PepSubManager extends PubSubManager {
	private List<PEPListener> mPepListeners = new ArrayList<PEPListener>();
	private PacketFilter mPacketFilter = new PacketExtensionFilter("event", "http://jabber.org/protocol/pubsub#event");

	/**
	 * Create a PepSubManager.
	 * 
	 * @param connection
	 *            the connection
	 */
	public PepSubManager(final Connection connection) {
		super(connection);
		init(connection);
	}

	/**
	 * Create a PepSubManager associated to the specified connection where the
	 * pubsub requests require a specific to address for packets.
	 * 
	 * @param connection
	 *            the connection
	 * @param toAddress
	 *            The pubsub specific to address (required for some servers)
	 */
	public PepSubManager(final Connection connection, final String toAddress) {
		super(connection, toAddress);
		init(connection);
	}

	/**
	 * Add a listener to PEP event.
	 * 
	 * @param listener
	 *            the listener
	 */
	public void addPEPListener(PEPListener listener) {
		if (!mPepListeners.contains(listener))
			mPepListeners.add(listener);
	}

	/**
	 * Remove a listener to PEP event.
	 * 
	 * @param listener
	 *            the listener
	 */
	public void removePEPListener(PEPListener listener) {
		mPepListeners.remove(listener);
	}

	/**
	 * Get a PepNode. This node is obtain without checking its existence as PEP
	 * should auto create it.
	 * 
	 * @param nodeName
	 *            the node name
	 * @return the node
	 */
	public LeafNode getPEPNode(String nodeName) {
		LeafNode node = new LeafNode(con, nodeName);
		node.setTo(to);
		return node;
	}

	/**
	 * Initialize the PepSubManager.
	 * 
	 * @param con
	 *            the connection
	 */
	private void init(Connection con) {
		PacketListener packetListener = new PacketListener() {

			@Override
			public void processPacket(Packet packet) {
				EventElement e = (EventElement) packet.getExtension("event", "http://jabber.org/protocol/pubsub#event");
				if (e.getEventType() != EventElementType.items)
					return;
				ItemsExtension it = (ItemsExtension) e.getEvent();
				if (it.getItemsElementType() != ItemsExtension.ItemsElementType.items)
					return;
				List<Item> items = (List<Item>) it.getItems();
				firePEPListeners(packet.getFrom(), it.getNode(), items);
			}
		};
		con.addPacketListener(packetListener, mPacketFilter);
	}

	/**
	 * Fire the PEP listeners.
	 * 
	 * @param from
	 *            the JID of the user who send the event
	 * @param node
	 *            the node of the items in the event
	 * @param items
	 *            the different items of the event
	 */
	private void firePEPListeners(String from, String node, List<Item> items) {
		for (PEPListener listener : mPepListeners) {
			listener.eventReceived(from, node, items);
		}
	}
}
